@article{FernandezBrunoGarcesetal.2020,
  author    = {Fernandez, Ricardo and Bruno, Giovanni and Garces, Gerardo and Nieto-Luis, H. and Gonzalez-Doncel, Gaspar},
  title     = {Fractional brownian motion of dislocations during creep deformation of metals},
  series = {Materials science \& engineering. A, Structural materials},
  volume    = {796},
  journal   = {Materials science \& engineering. A, Structural materials},
  publisher = {Elsevier},
  address   = {Lausanne},
  issn      = {0921-5093},
  doi       = {10.1016/j.msea.2020.140013},
  pages     = {8},
  year      = {2020},
  abstract  = {The present work offers an explanation on how the long-range interaction of dislocations influences their movement, and therefore the strain, during creep of metals. It is proposed that collective motion of dislocations can be described as a fractional Brownian motion. This explains the noisy appearance of the creep strain signal as a function of time. Such signal is split into a deterministic and a stochastic part. These terms can be related to two kinds of dislocation motions: individual and collective, respectively. The description is consistent with the fractal nature of strain-induced dislocation structures predicated in previous works. Moreover, it encompasses the evolution of the strain rate during all stages of creep, including the tertiary one. Creep data from Al99.8\% and Al3.85\%Mg tested at different temperatures and stresses are used to validate the proposed ideas: it is found that different creep stages present different diffusion characters, and therefore different dislocation motion character.},
  language  = {en}
}
@article{SerranoMunozFernandezSerranoSaliwanNeumannetal.2022,
  author    = {Serrano-Munoz, Itziar and Fern{\´a}ndez Serrano, Ricardo and Saliwan-Neumann, Romeo and Gonzalez-Doncel, Gaspar and Bruno, Giovanni},
  title     = {Dislocation substructures in pure aluminium after creep deformation as studied by electron backscatter diffraction},
  series = {Journal of applied crystallography / International Union of Crystallography},
  volume    = {55},
  journal   = {Journal of applied crystallography / International Union of Crystallography},
  publisher = {Munksgaard},
  address   = {Copenhagen},
  issn      = {1600-5767},
  doi       = {10.1107/S1600576722005209},
  pages     = {860 -- 869},
  year      = {2022},
  abstract  = {In the present work, electron backscatter diffraction was used to determine the microscopic dislocation structures generated during creep (with tests interrupted at the steady state) in pure 99.8\% aluminium. This material was investigated at two different stress levels, corresponding to the power-law and power-law breakdown regimes. The results show that the formation of subgrain cellular structures occurs independently of the crystallographic orientation. However, the density of these cellular structures strongly depends on the grain crystallographic orientation with respect to the tensile axis direction, with (111) grains exhibiting the highest densities at both stress levels. It is proposed that this behaviour is due to the influence of intergranular stresses, which is different in (111) and (001) grains.},
  language  = {en}
}